Past Year Questions: Kinematics Of Mechanisms - Mechanical Engineering MCQ

Match the items in columns I and II.
Column-I
P. Higher kinematic pair
Q. Lower kinematic pair
R. Quick return mechanism
S. Mobility of a linkage
Column-ll
1. Grubler's equation
2. Line contact
3. Euler's equation
4. Planer
5. Shaper
6. Surface contact

[2006]

Match the approaches given below to perform stated kinematics/dynamics analysis of machine.
Analysis
P. Continuous relative rotation
Q. Velocity and acceleration
R. Mobility
S. Dynamic - static analysis

Approach
1. D' Alembert's principle
2. Grubler's criterion
3. Grashof 's law
4. Kennedy's theorem

[2010]

Which of the following statements is INCORRECT?​

[2010]

A planar closed kinematic chain is formed with rigid links PQ = 2.0 m, QR = 3.0 m, RS = 2.5 m and SP= 2.7 m with all revolute joints. The link to be fixed to obtain rocker (rocker-rocker) mechanism is​

[2013]

In a statically determinate plane truss, the number of joints (j) and the number of members (m) are related by​

[2014]

Figure shows a quick return mechanism. The cranks OA rotates clockwise uniformly. OA = 2 cm, OO' = 4 cm. The ratio of time for forward motion to that for return motion is

[1995]

A rod of length 1 m is sliding in a corner as shown in figure. At an instant when the rod makes an angle of 60 degrees with the horizontal plane., the velocity of point A on the rod is 1m/ s. The angular velocity of the rod at this instant is

[1996]

The mechanism used in a shaping machine is

[2003]

The lengths of the links of a 4-bar linkage with revolute pairs only are p, q, r and s units. Given that p < q< r< s. Which of these links should be the fixed one, for obtaining a "double crank" mechanism?

[2003]

Match the following:
Type of Mechanism
P. Scott - Russel mechanism
Q. Geneva mechanism
R. Off-set slider-crank mechanism
S. Scotch Yoke mechanism

Motion achieved
1. Intermittent motion
2. Quick return motion
3. Simple harmonic motion
4. Straight line motion

[2004]

An instantaneous configuration of a four-bar mechanism, whose plane is horizontal, is shown in the figure below. At this instant, the angular velocity and angular acceleration of link O₂A are ω = 8 rad/s and α = 0, respectively, and the driving torque (τ) is zero. The link O₂A is balanced so that its centre of mass falls at O₂.

Which kind of 4-bar mechanism is O₂ABO₄?

[2005]

An instantaneous configuration of a four-bar mechanism, whose plane is horizontal, is shown in the figure below. At this instant, the angular velocity and angular acceleration of link O₂A are ω = 8 rad/s and α = 0, respectively, and the driving torque (τ) is zero. The link O₂A is balanced so that its centre of mass falls at O₂.

At the instant considered, what is the magnitude of the angular velocity of O₄B?

[2005]

An instantaneous configuration of a four-bar mechanism, whose plane is horizontal, is shown in the figure below. At this instant, the angular velocity and angular acceleration of link O₂A are ω = 8 rad/s and α = 0, respectively, and the driving torque (τ) is zero. The link O₂A is balanced so that its centre of mass falls at O₂.

At the same instant, if the component of the force at Joint A along AB is 30N, then the magnitude of the Joint reaction at O₂

_[2005]

In a four-bar linkage, S denotes the shortest link length, L is the longest link length, P and Q are the lengths of other two links. At least one of the three moving links will rotate by 360° if

[2006]

The input link O₂P of a four bar linkage is rotated at 2 rad/s in counter clockwise direction as shown below. The angular velocity of the coupler PQ in rad/s, at an instant when ∠O₄O₂P = 180°, is

[2007]

A quick return mechanism is shown below. The crank OS is driven at 2 rev/s in counter clockwise direction.

If the quick return ratio is 1 : 2, then the length of the crank in mm is

[2007]

A quick return mechanism is shown below. The crank OS is driven at 2 rev/s in counter clockwise direction.

 The angular speed of PQ in rev/s when the block R attains maximum speed during forward stroke (stroke with slower speed) is (in rad/s)

[2007]

A simple quick return mechanism is shown in the figure. The forward to return ratio of the quick return mechanism is 2 :1. If the radius of the crank O, P is 125 mm, then the distance d(in mm) between the crank centre to lever pivot centre point should be

[2009]

For the four-bar linkage shown in the figure, the angular velocity of link AB is 1 rad/s. The length of link CD is 1.5 times the length of link AB. In the configuration shown, the angular velocity of link CD in rad/s is

[2011]

A 4-bar mechanism with all revolute pairs has link lengths l_f = 20 mm, l_in = 40 mm, l_co = 50 mm and l_out = 60 mm. The suffixes 'f, in', 'co' and 'out' denote the fixed link, the input link, the coupler and output link respectively. Which one of the following statements is true about the input and output links?

[2014]

Consider a slider crank mechanism with non zero masses and inertia. A constant torque t is applied on the crank as shown in the figure. Which of the following plots best resembles variation of crank angle θ versus time

[2015]

For an Oldham coupling used between two shafts, which among the following statements are correct?
I. Torsional load is transferred along shaft axis.
II. A velocity ratio of 1 : 2 between shaft is obtained without using gears.
III. Bending load is transferred transverse to shaft axis.
IV. Rotation is transferred along shaft axis. 

[2018]

In a four bar planar mechanism shown in the figure, AB = 5 cm, AD = 4 cm and DC = 2 cm. In the configuration shown, both AB and DC are perpendicular to AD. The bar AB rotates with an angular velocity of 10 rad/s. The magnitude of angular velocity (in rad/s) of bar DC at this instant is

[2019]

The crank of a slider-crank mechanism rotates counter-clock wise (CCW) with a constant angular velocity ω, as shown. Assume the length of the crank to be r.

Using exact analysis, the acceleration of the slider in the y-direction, at the instant shown, where the crank is parallel to x-axis, is given by

[2019]

The number of degrees of freedom of a five link plane mechanism with five revolute pairs as shown in the figure is

[1993]

Match the following with respect to spatial mechanisms.

[2004]

The number of degrees of freedom of a planar linkage with 8 links and 9 simple revolute joints is

[2019]